/**
 * This file is part of mycollab-caching.
 *
 * mycollab-caching is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * mycollab-caching is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with mycollab-caching.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.esofthead.mycollab.lock;

import java.util.Collections;
import java.util.Map;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import org.apache.commons.collections.map.AbstractReferenceMap;
import org.apache.commons.collections.map.ReferenceMap;

import com.esofthead.mycollab.spring.ApplicationContextUtil;

/**
 * 
 * @author MyCollab Ltd.
 * @since 4.5.2
 *
 */
public class DistributionLockUtil {
	@SuppressWarnings({ "unchecked", "rawtypes" })
	private static Map map = Collections.synchronizedMap(new ReferenceMap(
			AbstractReferenceMap.WEAK, AbstractReferenceMap.WEAK));

	public static Lock getLock(String lockName) {
		try {
			DistributionLockService lockService = ApplicationContextUtil
					.getSpringBean(DistributionLockService.class);
			Lock lock = lockService.getLock(lockName);
			if (lock == null) {
				return getStaticDefaultLock(lockName);
			} else {
				return lock;
			}
		} catch (Exception e) {
			return getStaticDefaultLock(lockName);
		}
	}

	@SuppressWarnings("unchecked")
	private static Lock getStaticDefaultLock(String lockName) {
		synchronized (map) {
			Lock lock = (Lock) map.get(lockName);
			if (lock == null) {
				lock = new ReentrantLock();
				map.put(lockName, lock);
			}
			return lock;
		}
	}
}
